Nat parks might be a bit slow, but a few showers 2 nights ago with a few more forecast for tonight and tomorrow, so I'd be surprised they would be closed by the weekend, but as said, they might be slow to react if the showers do happen.
Myall River Camp......better and cheaper than Mungo.
Clarencetown......been there 14 times in 10 yrs, so at least I think it's OK !!